cmd/compile: remove -A flag

mkbuiltin.go now generates builtin.go using go/ast instead of running
the compiler, so we don't need the -A flag anymore.

Passes toolstash -cmp.

Change-Id: Ifa70f4f3c9feae10c723cbec81a0a47c39610090
Reviewed-on: https://go-review.googlesource.com/31497Reviewed-by: Robert Griesemer <gri@golang.org>

src/cmd/compile/internal/gc/align.go

@@ -227,12 +227,9 @@ func dowidth(t *Type) {
 		}
 		w = 1 // anything will do
 
-	// dummy type; should be replaced before use.
 	case TANY:
-		if Debug['A'] == 0 {
-			Fatalf("dowidth any")
-		}
-		w = 1 // anything will do
+		// dummy type; should be replaced before use.
+		Fatalf("dowidth any")
 
 	case TSTRING:
 		if sizeof_String == 0 {

src/cmd/compile/internal/gc/bexport.go

@@ -132,9 +132,9 @@ package gc
 import (
 	"bufio"
 	"bytes"
-	"math/big"
 	"encoding/binary"
 	"fmt"
+	"math/big"
 	"sort"
 	"strings"
 )
@@ -204,14 +204,11 @@ type exporter struct {
 // export writes the exportlist for localpkg to out and returns the number of bytes written.
 func export(out *bufio.Writer, trace bool) int {
 	p := exporter{
-		out:      out,
-		strIndex: map[string]int{"": 0}, // empty string is mapped to 0
-		pkgIndex: make(map[*Pkg]int),
-		typIndex: make(map[*Type]int),
-		// don't emit pos info for builtin packages
-		// (not needed and avoids path name diffs in builtin.go between
-		// Windows and non-Windows machines, exposed via builtin_test.go)
-		posInfoFormat: Debug['A'] == 0,
+		out:           out,
+		strIndex:      map[string]int{"": 0}, // empty string is mapped to 0
+		pkgIndex:      make(map[*Pkg]int),
+		typIndex:      make(map[*Type]int),
+		posInfoFormat: true,
 		trace:         trace,
 	}
 

src/cmd/compile/internal/gc/bimport.go

@@ -10,9 +10,9 @@ package gc
 
 import (
 	"bufio"
-	"math/big"
 	"encoding/binary"
 	"fmt"
+	"math/big"
 	"strconv"
 	"strings"
 )

src/cmd/compile/internal/gc/export.go

@@ -82,8 +82,7 @@ func autoexport(n *Node, ctxt Class) {
 		return
 	}
 
-	// -A is for cmd/gc/mkbuiltin script, so export everything
-	if Debug['A'] != 0 || exportname(n.Sym.Name) || initname(n.Sym.Name) {
+	if exportname(n.Sym.Name) || initname(n.Sym.Name) {
 		exportsym(n)
 	}
 	if asmhdr != "" && n.Sym.Pkg == localpkg && n.Sym.Flags&SymAsm == 0 {
@@ -271,7 +270,7 @@ func importsym(s *Sym, op Op) {
 
 	// mark the symbol so it is not reexported
 	if s.Def == nil {
-		if Debug['A'] != 0 || exportname(s.Name) || initname(s.Name) {
+		if exportname(s.Name) || initname(s.Name) {
 			s.Flags |= SymExport
 		} else {
 			s.Flags |= SymPackage // package scope

src/cmd/compile/internal/gc/init.go

@@ -75,11 +75,6 @@ func anyinit(n []*Node) bool {
 }
 
 func fninit(n []*Node) {
-	if Debug['A'] != 0 {
-		// sys.go or unsafe.go during compiler build
-		return
-	}
-
 	nf := initfix(n)
 	if !anyinit(nf) {
 		return

src/cmd/compile/internal/gc/main.go

@@ -152,7 +152,6 @@ func Main() {
 
 	flag.BoolVar(&compiling_runtime, "+", false, "compiling runtime")
 	obj.Flagcount("%", "debug non-static initializers", &Debug['%'])
-	obj.Flagcount("A", "for bootstrapping, allow 'any' type", &Debug['A'])
 	obj.Flagcount("B", "disable bounds checking", &Debug['B'])
 	flag.StringVar(&localimport, "D", "", "set relative `path` for local imports")
 	obj.Flagcount("E", "debug symbol export", &Debug['E'])
@@ -677,10 +676,6 @@ func findpkg(name string) (file string, ok bool) {
 // so that the compiler can generate calls to them,
 // but does not make them visible to user code.
 func loadsys() {
-	if Debug['A'] != 0 {
-		return
-	}
-
 	block = 1
 	iota_ = -1000000
 

src/cmd/compile/internal/gc/pgen.go

@@ -321,9 +321,6 @@ func compile(fn *Node) {
 			return
 		}
 
-		if Debug['A'] != 0 {
-			return
-		}
 		emitptrargsmap()
 		return
 	}

src/cmd/compile/internal/gc/universe.go

@@ -27,7 +27,6 @@ var basicTypes = [...]struct {
 	{"complex128", TCOMPLEX128},
 	{"bool", TBOOL},
 	{"string", TSTRING},
-	{"any", TANY},
 }
 
 var typedefs = [...]struct {
@@ -117,6 +116,7 @@ func lexinit() {
 
 	idealstring = typ(TSTRING)
 	idealbool = typ(TBOOL)
+	Types[TANY] = typ(TANY)
 
 	s := Pkglookup("true", builtinpkg)
 	s.Def = nodbool(true)
@@ -461,7 +461,7 @@ func finishUniverse() {
 	// package block rather than emitting a redeclared symbol error.
 
 	for _, s := range builtinpkg.Syms {
-		if s.Def == nil || (s.Name == "any" && Debug['A'] == 0) {
+		if s.Def == nil {
 			continue
 		}
 		s1 := lookup(s.Name)